CNN  —  The Arctic has long filled humans with awe, but there are now profoundly worrying signals coming from the frozen landscape at the top of our planet, and scientists are deeply concerned about its future as the Trump administration pulls the US out of global climate strategy and guts its science agencies. Last month was extreme: Temperatures in parts of the Arctic spiked 36 degrees Fahrenheit, or 20 Celsius, above normal. By the end of the month, sea ice was at its lowest level ever